OPT: extract `combadge.core.BaseRequest`

[codecov[bot]]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (43e93c3) 93.03% compared to head (8b8b395) 93.03%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #65 +/- ## ======================================= Coverage 93.03% 93.03% ======================================= Files 31 31 Lines 747 747 Branches 76 77 +1 ======================================= Hits 695 695 Misses 42 42 Partials 10 10 ``` | [Files](https://app.codecov.io/gh/kpn/combadge/pull/65?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=kpn) | Coverage Δ | | |---|---|---| | [combadge/support/http/request.py](https://app.codecov.io/gh/kpn/combadge/pull/65?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=kpn#diff-Y29tYmFkZ2Uvc3VwcG9ydC9odHRwL3JlcXVlc3QucHk=) | `100.00% <100.00%> (ø)` | | | [combadge/support/httpx/backends/async\_.py](https://app.codecov.io/gh/kpn/combadge/pull/65?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=kpn#diff-Y29tYmFkZ2Uvc3VwcG9ydC9odHRweC9iYWNrZW5kcy9hc3luY18ucHk=) | `97.56% <100.00%> (-0.06%)` | :arrow_down: | | [combadge/support/httpx/backends/sync.py](https://app.codecov.io/gh/kpn/combadge/pull/65?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=kpn#diff-Y29tYmFkZ2Uvc3VwcG9ydC9odHRweC9iYWNrZW5kcy9zeW5jLnB5) | `97.50% <100.00%> (-0.07%)` | :arrow_down: | | [combadge/support/soap/request.py](https://app.codecov.io/gh/kpn/combadge/pull/65?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=kpn#diff-Y29tYmFkZ2Uvc3VwcG9ydC9zb2FwL3JlcXVlc3QucHk=) | `100.00% <100.00%> (ø)` | | | [combadge/support/zeep/backends/async\_.py](https://app.codecov.io/gh/kpn/combadge/pull/65?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=kpn#diff-Y29tYmFkZ2Uvc3VwcG9ydC96ZWVwL2JhY2tlbmRzL2FzeW5jXy5weQ==) | `75.34% <100.00%> (-0.34%)` | :arrow_down: | | [combadge/support/zeep/backends/sync.py](https://app.codecov.io/gh/kpn/combadge/pull/65?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=kpn#diff-Y29tYmFkZ2Uvc3VwcG9ydC96ZWVwL2JhY2tlbmRzL3N5bmMucHk=) | `81.66% <100.00%> (-0.31%)` | :arrow_down: | | [combadge/core/request.py](https://app.codecov.io/gh/kpn/combadge/pull/65?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=kpn#diff-Y29tYmFkZ2UvY29yZS9yZXF1ZXN0LnB5) | `91.66% <90.90%> (+1.66%)` | :arrow_up: |

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